ENGINEERING TRANSACTIONS
ROZPRAWY IN¯YNIERSKIE
A QUARTERLY JOURNAL
- I.G. Raftoyiannis, A.N. Kounadis:
Dynamic buckling of non-sway imperfect rectangular steel frames
- S. Ochelski, T. Niezgoda:
Parameter selection rules for elements of energy-absorbing structures
- I. Markiewicz:
Analysis of elastic properties of thin-walled structures designed by SADSF method
- M.A. De Rosa, M. Lippiello:
Natural vibration frequencies of tapered beams
- I.G. Raftoyiannis, A.N. Kounadis:
Dynamic buckling of non-sway imperfect rectangular steel frames
- A nonlinear stability analysis is performed on non-sway rectangular two-bar steel frames
subjected to a concentrated, suddenly applied joint load with constant magnitude and infinite
duration. Using energy and geometric considerations, the dynamic buckling load is determined
by considering the frame, being a continuous system, as a discrete 2 degrees-of-freedom system
with corresponding coordinates of the two bar axial forces. The effect of imperfection sensitivity
due to loading eccentricity is also addressed. A qualitative and quantitative analysis
of these autonomous systems yields a substantial reduction of the computational work. The
efficiency and reliability of the nonlinear stability analysis proposed herein is illustrated by
several examples, which are also solved using finite element nonlinear analysis.
Contents
- S. Ochelski, T. Niezgoda:
Parameter selection rules for elements of energy-absorbing structures
- The paper presents the results of an experimental program and gives suggestions on the
design of an energy-absorbing structure with respect to the kinetic energy of impact. The
presented results account for the influence of the following factors on the energy-absorbing
capability: matrix and reinforcement type, structure, shape and thickness of elements.
Contents
- I. Markiewicz:
Analysis of elastic properties of thin-walled structures designed by SADSF method
- The paper presents the results of analyses of elastic properties of thin-walled structures
designed by means of the SADSF method, carried out in order to confirm its practical usefulness.
The SADSF method makes it possible - without applying any iterative correction
procedures - to effectively solve the problems of design of such structures. The method can be
applied in cases when only boundary conditions are given. The obtained solutions are free of
the structural errors which can significantly deteriorate load carrying ability of structures of
this class.
Contents
- M.A. De Rosa, M. Lippiello:
Natural vibration frequencies of tapered beams
- In this paper the free vibrations frequencies of tapered Euler-Bernoulli beams are calculated,
in the presence of an arbitrary number of rotationally and/or axially, elastically flexible
constraints. The dynamic analysis is performed by means of the so-called cell discretization
method (CDM), according to which the beam is reduced to a set of rigid bars, linked together
by elastic sections, where the bending stiffness and the distributed mass of the bars is concentrated.
The resulting stiffness matrix and mass matrix are easily deduced, and the generalized
symmetric eingenvalue problem can be immediately solved. Various numerical comparisons
allow us to show the potentialities of the proposed approach.
Contents
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